Control apparatus for gang condensers



Alig- 9, 1932. T. J. scoFlELD ET Al. 1,871,011

CONTROL APPARATUS FOR GANG CONDENSERS Filed oct. 11, 1929 e in o fr o o IHIIIHIII UNITED STATES PAI Patented ug. 9, 1932 TIIEODORE I. sooPIELD AND WILLIAM D. ivIINER, oP'JAcKsON, MICHIGAN, AssIeNoRs 'ro sPAPYKs-WITIIINGTON COMPANY; A CORPORATION 'OP oI-IIO CONTROL APPARATUS POR GANG oo NnENsaRsV This invention relates tocontrol apparatus for gang condensers and the like in radio receiving sets. v Y

An object of the invention is to construct a contro-l device with indicating means that will be of pleasing appearance, rigid construction and of low cost and capable: of rapid assembly. Y

Gtherj objects will appear in the following specification, reference being hadto the drawing, in which: l j" A Fig. 1 is an end View of the complete assembly-of controland indicating device. j

Fig. 2 is a front'view of the hub and Vspider member forming the frame of the device.

Fig. Sis an edge view of thevdevice shown in Fig. 2.

Fig. 5 is a view of the front side seen from the Yfront of Fig. '1. j i

F'g. 6 is a. partial sectional view ofthe complete assembly takenv on the-line A-v-A of Fig.` 1, the apparatus being viewed from the left of Fig. 1.

plate Vas strip placed around theldrum for indicating the adjustment of the control member. l

VRadio receiving sets as now made contain a 'plurality of condensers with the rotors joined together by a common rotatable shaft.

rl`heco1f1densers are not shown in the drawing but' 1 indicates a section of ithe shaft of such a gang condenser. On the shaft isa spider 2, which is preferably die-cast. This vthere may be holes 7 to make a light construction and reduce the amount of metal necese sary. The ribs and web portion are joined to an arcuate member 8. The arcuate member 8l has radially projecting lugs 9 and 10 to receive the ends 11 and 12`of the Celluloid or other strip shown in Fig` 7. Screws 13 and is a view of the rear side plate asV seenfromtherear o fFlg. 1.`

washers 14E such as shown ingFig. 6..clam-p the ends o-f the strip to the lugs in cooper-l ation withslots 15 in the .ends ofthe strip.V

The rearvdisc fiange 16V (Fig. 4) is preferably stamped from thin Vmetal so that it 'has a peripheral groove17 forreception of the adjusting cable tobe. later referredto. VAfter being stamped downwardly; and thence upwardlytoforml the groove '17 the outer portionof the disc 16 vextends radiallyoutward andjis forced overinan axial direction first y outwardly and theninwardly to form aside groove'. 18 for reception ofthe Celluloid strip 11.- The rear disc 16'has a plurality of holes 19 adapted to line with-the holes 2O in the flange ofthe spider. 'The flangel 16has the periphery notched at 21 .topermit the insertion and removal of strip; .Y .f V`The front disc larly to the Vdisc 16 to form peripheral groove y23and side groove 24 but it has a portion cut away toleave web 25. The cutaway portion` permits the ,insertion of a lampv- (not shown) I Y Y to illuminate the dial. Fig. 7 is a development of the Celluloid `'member k22 also hasy a notch 2Q adaptedjto linewith .the notch' 21 when the parts are assembled so that the strip 11 can be inserted -andrwithdrawn In assembling the apparatus the disc- 16 is'placed in properposition against thev rear of the spider, as show njin Fig. 2. These two parts are then fastened vtogether by tight fitting` pins driven through `themember 16, into the rear ends of holes 27 or inv some cases lugs may be die-cast` at the rear of the holes27 to take the placeof these pins. 'In the latter the lugs would be peened over to ,hold the member 16 rigidly in place. The front disc: member 22 is then. placed inpositionwith itsicentral hole 31 fitting the Celluloid indicating*v e over projection 4 ofthespider and with'the l holes 26 in alignment with the holes y27,-which latter are threaded. Screws are then threaded'into the holes 27 nto .clamp thefront mem- Y bertightly inV position. f i V 1 x After the'parts are assembled as just described the entire drum is pushed .on to shaft 1 of the gang condenser and screw drivers Vare inserted through holes 32 in the spider to adjust setJ screws 33 to clamp the drum tightly against the shaft. The Celluloid or fibre strip 11 is then inserted in the grooves 18 and 24 commencing at notches 21 and 29.

i If' the strip binds it'can bereadily pushed into position by inserting the fingers through the opening or cut-out portion of the front member 22. Also, if thefstrip binds the screws threaded in the holes27 may be loosened and retightened when the f strip is in position. When the strip is assembled the grooves 15 will be in position on lugs 9 and 10and screws i 13 pressing against washer 14 will thread into-these`- lugs and-clamp-the strip in position. v Y The arrangement of parts issuch that complete drum even with the Celluloid strip in positionv can be readily removed or attached to the shaft 1 because the holes-32 are 'not cove-red Vup by any of the assembly.

`VVhe'n the assembled indicating drum is-in position on shaftl a cable or cord 33 has-"one end fastened toscrew YsheaveY or `drurr1'34 around which it may be wrapped one ormore times. The cordthenpasses around a portion of the groov'e'23 then'c'erthrough the hole 35 infront member 22, and a po`rtion`33cil extends around lug-10 and thencegthrough hole 36 into rear member'l. Thecable or cord then passes around `groove 17 and'is at- Y j tached to screw sheavel 35"'after passing around it one or more times. One of the screw drums, for example, -35,is clamped against control shaft 36 byset screws`37 preferably arranged at right angles, as shown in Fig. 1.` The other drum may be pressed tightly on' the shaftas the adjustment of one'drum is sufficient to permit assembly of the cable with` the desired tautness. T he lcontrol Hshaft is attached to knob 38, as shown in Fig. 1. 'The lcontrol'shaft 36 is attachedgto knobvpreferably in accordancey with the invention ofV ,control knobs, described in application No. 403,528, filed'October 30, 1929,-though, of

course, other fastening means 'may' be used.V

` I-Iaving described our inventionwhat we claim is: I 5 n Y 1. In indicating drums for condensers and the like, disc flanges bent downwardly and Ythence upwardly to form driving grooves,

and at an o-uterportionbent outwardly and then inwardly to formside grooves, means for securing said flanges together with the `side grooves .facing each other andan indicatino strip secured in Vsaid side grooves. Y

2. In indicating drums for 'condensers and thelike, disc flanges bent downwardly and then upwardly to form driving grooves, vand jstripl to said lugs.

in said side grooves and means to clamp the ends of said strip to said lugs.

3. In indicating drums for condensers and the like, disc flanges having central holes, bent downwardly and then upwardly to form grooves, and at an outer portion bent outwardly and then Y inwardly to form side grooves, a hub member having a hole and peripheral lugs, means to 4clamp said flanges to. said hub member with vthe side groovesfacing each otheigand with all said holes in alignment, an indicating strip in said side grooves, and means'to clamp the ends of said 4. In indicating drums for condensers and the like, disc flanges having driving grooves opening at the top Vand further grooves opening at the side, means to join said ianges together with the side grooves facing each other, an indicating strip secured in said side grooves, a shaft arranged at right angles to said flanges, sheaves onsaid shaft is alignment with the first mentioned groove and a cable secured in said iirstmentioned groove having an end passing around each sheave.

5. In radio dials a pairy of'anges each lhaving a circular groove on a' side, and a circular groovel on the opposite side, an indieating strip secured in said irst mentioned grooves and driving means .passing around the second 'mentioned grooves.

6. In radio dials a pair'of circular anges, each having a portion extending radially inwardly and thence outwardly forming a groove yand another-portion extending axially outwardly and .thence inwardlyy to form a Vsecond groove, said first mentioned groove being on theoutside of saidflange and the second mentioned groove being on the inside thereof, an indicatingV strip inthe second mentioned groovesY and driving means in the first mentioned groove.

In testimony whereof, we have 'signed our names to this specification this 7th day of October 1929. l v

. THEODORE J. SCOFIELD.

' WILLIAM '1). MINER.

an'outerV portion bent outwardly and. then l. inwardly to form sidegrooves,y a hub member Y Y. havingperipheral lugs, means to clamp said flanges to saidY hub member with the side grooves facing each other,an indicating strip Y' iso 

